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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - New Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Stockholders' equity attributable to parent $ (756,636) $ (709,576) $ (730,408) $ (687,168) $ (650,818) $ (619,688)
Additional Paid-In Capital            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Stockholders' equity attributable to parent (895,151) (867,890) (942,091) (911,368) (894,108) (873,201)
Accumulated Deficit            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Stockholders' equity attributable to parent $ 137,956 $ 157,832 211,895 $ 224,425 $ 243,506 $ 253,875
Cumulative Effect, Period of Adoption, Adjusted Balance            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Long-term debt     64,900      
Increase (decrease) in deferred income taxes     15,700      
Cumulative Effect, Period of Adoption, Adjusted Balance | Additional Paid-In Capital            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Stockholders' equity attributable to parent     96,500      
Cumulative Effect, Period of Adoption, Adjusted Balance | Accumulated Deficit            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Stockholders' equity attributable to parent     $ (47,200)